Yongzhu Fm
Type Locality and Naming
The type section is lies from Angjie to Xiala Mt., 4.5 km east of Yunzhug Township, Xianza (Shenzha) County, Tibet, and the reference section is from the south slope of Deriangma Mt. to Xiala Mt., 6 km northeast of Yunzhug. It was named by Lunzhujiacuo et al. in 1978.
Synonym: Yunzhug Fm, Yongzhugongshe Fm
Lithology and Thickness
Claystone to Sandstone and Clayey Limestone. Dominated by gray-green and gray-black shale, siltstone and fine-grained sandstone, intercalated with thin-bedded clayey limestone; thickness 737 m.
Relationships and Distribution
Lower contact
Conformable contact with the underlying Barialongzhai Fm
Upper contact
Conformable contact with the overlying Sisuo Fm
Regional extent
Mainly distributed in the areas such as Yunzhug Township of Xianza, both flanks of the Tarma syncline and Mangco.
GeoJSON
Fossils
Corals Rhopalolasma ryistonense, R. bradbournense, R. zhongguoense, Mirusophyllum pachyseptatum, M. breviseptatum, Barrandeophyllum choniukounense and Zaphrentites cf. shunnerensis; Brachiopods Balakhonia kokdscharensis, Chonetipustula ferganensis, Productus Productus and Fluctuaria xainzaensis; Ammonoids Goniatites cf. striatus kentuckiensis and Nuculoceras primitivus.
Age
Depositional setting
It is interpreted as littoral-neritic deposits
Additional Information